Behind the Scenes of Glee Season 4, Episode 8: "Thanksgiving" — Which Guy Hand Never Heard of "Gangnam Style"? (VIDEO)

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Glee on Fox on YouTube

We learn plenty of fun behind the scenes facts about Glee Season 4, Episode 9: “Swan Song” in this video, but one of them surprises us most of all. Blake Jenner(Ryder) had never heard of PSY's "Gangnam Style" before having to perform it on the show! Not the case with his co-star Darren Criss (Blaine), though. It sounds like Darren was already well-acquainted with the tune.